DTC Diagnosis Procedure
- CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect air fuel ratio (A/F) sensor 1 harness connector.
- Turn ignition switch ON.
- Check the voltage between A/F sensor 1 harness connector and ground.
+ Ground Voltage A/F sensor 1 Connector Terminal F12 4 Ground Battery voltage
Is the inspection result normal?
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GO TO 3.
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GO TO 2.
- CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
A/F sensor 1 IPDM E/R Continuity Connector Terminal Connector Terminal F12 4 F96 75 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
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Perform trouble diagnosis for power supply circuit.
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Repair or replace malfunctioning part.
- CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
A/F sensor 1 ECM Continuity Connector Terminal Connector Terminal F12 1 F25 86 Existed 2 88 - Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
A/F sensor 1 Ground Continuity Connector Terminal F12 1 Ground Not existed 2 ECM Ground Continuity Connector Terminal F25 86 Ground Not existed 88 - Also check harness for short to ground and short to power.
Is the inspection result normal?
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GO TO 4.
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Repair or replace malfunctioning part.
- REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to Exploded View .
CAUTION:- Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new A/F sensor, clean exhaust system threads.
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INSPECTION END